PIM is not restricted to the local device. It can access data from an attached SIM or another remote device.
PIM并不局限于本地设备，它可以访问一个附加SIM或另一个远程设备中的数据。
2
Above the kernel, running in user mode, are the device drivers, each one running as a separate process tightly restricted by the memory management hardware to accessing only its own memory.